Subset igraph graph by label

r igraph
Michael Davidson picture Michael Davidson · Apr 7, 2013 · Viewed 8.4k times · Source

I am trying to subset a igraph graph by an edge characteristics (like its label). In the reproducible example I have shamelessly stolen from another post with a little modification, I would like to be able to separate the Best Friend ties (BF) from the Family ties (FAM):

edges <- matrix(c(103, 86, 24, 103, 103, 2, 92, 103, 87, 103, 103, 101, 103, 44), ncol=2, byrow=T)
g <- graph(as.vector(t(edges)))
E(g)[c(2:4,7)]$label<-"FAM"
E(g)[c(1,5,6)]$label<-"BF"

The best I can do so far is display the edges which have one type of tie:

E(g)[E(g)$label=="BF"]
V(g)[E(g)$label=="BF"]

Answer

Solomon picture Solomon · Apr 7, 2013

how about:

gfam <- subgraph.edges(graph=g, eids=which(E(g)$label=="FAM"), delete.vertices = TRUE)
gbf <- subgraph.edges(graph=g, eids=which(E(g)$label=="BF"), delete.vertices = TRUE)

Suggestion for igraph/network analysis tutorial/shameless plug: http://sna.stanford.edu/rlabs.php

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